How?
Have you read the help section?
If so, and you are still confused many of us will help with specific questions.
Do you need to be a premium member to create a board?
No, you can create 1 board as a standard member I think.
..and I'm not sure, but I believe you can make as many boards as you like, but only one can go through the review process and go "live". You can probably create private Dev games on other boards that you create.